CN116034613B - Method and apparatus for frequency hopping of sounding reference signals in partial bandwidth - Google Patents

Abstract

In some scenarios, SRS transmission over the full SRS bandwidth may be unnecessary and/or inefficient. Accordingly, there is a need for a method of SRS transmission over less than the full SRS bandwidth. Techniques and solutions for SRS transmission using only a portion of the full SRS bandwidth or a portion of the SRS bandwidth are described herein. The present disclosure provides for generating SRS transmissions using a partial SRS bandwidth using a sounding mode using only the partial SRS bandwidth and/or by various SRS sequences configured for the partial SRS bandwidth. An apparatus receives an SRS configuration indicating a full SRS bandwidth, determines a frequency hopping pattern for SRS transmissions based on the SRS configuration, and the frequency hopping pattern is limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth, and transmits the SRS transmissions to a base station based on the frequency hopping pattern.

Description

Method and apparatus for frequency hopping of sounding reference signals in partial bandwidth

Technical Field

The present disclosure relates generally to communication systems, and more particularly to reference signals transmitted from user equipment to a base station within a certain bandwidth.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, and even global levels. An example telecommunications standard is 5G New Radio (NR). The 5G NR is part of the continuous mobile broadband evolution promulgated by the third generation partnership project (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the internet of things (IoT)), and other requirements. The 5G NR includes services associated with enhanced mobile broadband (eMBB), large-scale machine type communications (mMTC), and ultra-reliable low-latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements in 5G NR technology. These improvements may also be applicable to other multiple access techniques and telecommunication standards employing these techniques.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In access networks of some example Radio Access Technologies (RATs), such as 5G New Radio (NR) access networks, a base station may use at least one Sounding Reference Signal (SRS) to estimate at least one channel (e.g., an uplink channel) on which to receive transmissions from a User Equipment (UE). Additionally or alternatively, SRS may be used for uplink frequency selective scheduling and/or uplink timing estimation. Thus, the UE transmits at least one SRS to the base station, but the UE may transmit the SRS over a wider bandwidth than the uplink channel. In this case, the UE may probe all ports of the SRS resource in each symbol of the SRS resource.

When the UE transmits SRS, full bandwidth may be available for SRS transmission. However, the full SRS bandwidth may be the entire bandwidth of interest, but less than the entire system bandwidth (although the bandwidth of interest may potentially be equal to the system bandwidth). In some aspects, the base station may then configure the full SRS bandwidth for the UE.

Potentially, the UE may be configured to use frequency hopping for SRS. For example, the UE may not have sufficient transmit power to probe over the full SRS bandwidth (e.g., when the UE is near the cell edge), and thus, the base station may configure the UE to use frequency hopping for SRS. However, when frequency hopping is used, the UE may still transmit SRS over the full SRS bandwidth, but may do so over multiple symbols (e.g., multiple adjacent symbols).

In some scenarios, SRS transmission over the full SRS bandwidth may be unnecessary and/or inefficient (e.g., in terms of power overhead). Thus, there is a need for a method for SRS transmission over less than the full SRS bandwidth.

The present disclosure describes various techniques and solutions for SRS transmission using only a portion of the full SRS bandwidth or a portion of the SRS bandwidth. Such techniques and solutions for SRS transmission using a portion of the SRS bandwidth may allow UEs to multiplex such that a greater number of UEs can transmit SRS in a cell. In addition, SRS transmission using a portion of the SRS bandwidth may reduce some power overhead generated by the UE from the SRS transmission.

In some aspects, the present disclosure provides SRS transmission using a partial SRS bandwidth through a sounding mode (e.g., a frequency hopping mode) using only a partial SRS bandwidth. In some other aspects, the present disclosure provides SRS transmission using a partial SRS bandwidth through various SRS sequence generation configured for the partial SRS bandwidth.

In one aspect of the disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may be a UE. The apparatus is configured to receive an SRS configuration from a base station indicating a full SRS bandwidth. The apparatus is also configured to determine a frequency hopping pattern for SRS transmission based on the SRS configuration and the frequency hopping pattern can be limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth. In addition, the apparatus is configured to send an SRS transmission to the base station based on the frequency hopping pattern.

In another aspect of the disclosure, another method, another computer-readable medium, and another apparatus are provided. The other device may be a base station. The other apparatus is configured to transmit an SRS configuration to the UE indicating a full SRS bandwidth. The other apparatus is further configured to receive an SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration and the frequency hopping pattern is limited to a partial SRS bandwidth that is less than the full SRS bandwidth.

To the accomplishment of the foregoing and related ends, one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the description is intended to include all such aspects and their equivalents.

Drawings

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network.

Fig. 2A is a schematic diagram illustrating an example of a first frame in accordance with aspects of the present disclosure.

Fig. 2B is a schematic diagram illustrating an example of DL channels within a subframe according to aspects of the present disclosure.

Fig. 2C is a schematic diagram illustrating an example of a second frame in accordance with aspects of the present disclosure.

Fig. 2D is a diagram illustrating an example of UL channels within a subframe in accordance with aspects of the present disclosure.

Fig. 3 is a schematic diagram showing an example of a base station and a User Equipment (UE) in an access network.

Fig. 4 is a diagram illustrating an example configuration for transmission of a Sounding Reference Signal (SRS).

Fig. 5 is a diagram illustrating an example resource mapping of SRS resources.

Fig. 6 is a call flow diagram illustrating example operations for SRS transmission by a UE to a base station.

Fig. 7 is a diagram illustrating an example frequency hopping pattern for SRS resources over a full bandwidth configured for SRS.

Fig. 8 is a diagram illustrating an example frequency hopping pattern for SRS transmission over a portion of a full bandwidth configured for SRS.

Fig. 9 is a diagram illustrating other example frequency hopping patterns for SRS transmission over a portion of the full bandwidth configured for SRS.

Fig. 10 is a diagram illustrating further example frequency hopping patterns for SRS transmission over a portion of a full bandwidth configured for SRS.

Fig. 11 is a flow chart of a method of wireless communication by a UE.

Fig. 12 is a flow chart of a method of wireless communication by a base station.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. It will be apparent, however, to one skilled in the art that the concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of the telecommunications system will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the detailed description below and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

For example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics Processing Units (GPUs), central Processing Units (CPUs), application processors, digital Signal Processors (DSPs), reduced Instruction Set Computing (RISC) processors, system on a chip (SoC), baseband processors, field Programmable Gate Arrays (FPGAs), programmable Logic Devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in the processing system may execute the software. Software should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software components, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like, whether referred to as software, firmware, middleware, microcode, hardware description language, or other names.

Accordingly, in one or more example embodiments, the described functionality may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored or encoded on a computer-readable medium as one or more instructions or code. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise Random Access Memory (RAM), read-only memory (ROM), electrically Erasable Programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the above-described types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

Fig. 1 is a schematic diagram illustrating an example of a wireless communication system and an access network 100. A wireless communication system, also referred to as a Wireless Wide Area Network (WWAN), includes a base station 102, a User Equipment (UE) 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G core (5 GC)). Base station 102 may include a macrocell (high power cellular base station) and/or a small cell (low power cellular base station). The macrocell includes a base station. Small cells include femto cells, pico cells, and micro cells.

A base station 102 configured for 4G Long Term Evolution (LTE), referred to collectively as evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access network (E-UTRAN), may interface with the EPC 160 over a first backhaul link 132 (e.g., an S1 interface). A base station 102 configured for a 5G New Radio (NR), collectively referred to as a next generation RAN (NG-RAN), may interface with a core network 190 over a second backhaul link 184. The base station 102 may perform one or more of the following functions, among others, transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio Access Network (RAN) sharing, multimedia Broadcast Multicast Services (MBMS), user and device tracking, RAN Information Management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or the core network 190) with each other over a third backhaul link 134 (e.g., an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

The base station 102 may communicate wirelessly with the UE 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102 'may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network comprising both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a home evolved node B (eNB) (HeNB) and the HeNB may provide services to a restricted group called a Closed Subscriber Group (CSG). The communication link 120 between the base station 102 and the UE 104 may include Uplink (UL) (also referred to as a reverse link) transmissions from the UE 104 to the base station 102 and/or Downlink (DL) (also referred to as a forward link) transmissions from the base station 102 to the UE 104. Communication link 120 may use multiple-input multiple-output (MIMO) antenna techniques including spatial multiplexing, beamforming, and/or transmit diversity. The communication link may be through one or more carriers. The base station 102/UE 104 may use a spectrum of up to Y megahertz (MHz) (x component carriers) per carrier bandwidth allocated in carrier aggregation for up to Yx MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) for transmissions in each direction. The carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels such as a Physical Sidelink Broadcast Channel (PSBCH), a Physical Sidelink Discovery Channel (PSDCH), a Physical Sidelink Shared Channel (PSSCH), and a Physical Sidelink Control Channel (PSCCH). D2D communication may be through a variety of wireless D2D communication systems such as, for example, wiMedia, bluetooth, zigBee, wi-Fi, LTE, or NR based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.

The wireless communication system may also include a Wi-Fi Access Point (AP) 150 that communicates with Wi-Fi Stations (STAs) 152 via a communication link 154 in, for example, a 5 gigahertz (GHz) unlicensed spectrum or the like. When communicating in the unlicensed spectrum, STA 152/AP 150 may perform Clear Channel Assessment (CCA) prior to communication to determine whether a channel is available.

The small cell 102' may operate in licensed and/or unlicensed spectrum. When operating in unlicensed spectrum, the small cell 102' may employ NR and use the same unlicensed spectrum (e.g., 5GHz, etc.) as used by the Wi-Fi AP 150. The use of NR small cells 102' in unlicensed spectrum may improve coverage of the access network and/or increase capacity of the access network.

Electromagnetic spectrum is often subdivided into various categories, bands, channels, etc., based on frequency/wavelength. In 5G NR, two initial operating bands have been identified as frequency range names FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). The frequency between FR1 and FR2 is often referred to as the mid-band frequency. Although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the "below 6GHz" band in various documents and articles. Similar naming problems sometimes occur with respect to FR2, which is often (interchangeably) referred to in documents and articles as the "millimeter wave" band, although it is different from the Extremely High Frequency (EHF) band (30 GHz-300 GHz), which is identified by the International Telecommunications Union (ITU) as the "millimeter wave" band.

In view of the above, unless specifically stated otherwise, it should be understood that the term "below 6GHz" and the like, if used herein, may broadly represent frequencies that may be less than 6GHz, may be within FR1, or may include mid-band frequencies. Furthermore, unless specifically stated otherwise, it should be understood that the term "millimeter wave" or the like, if used herein, may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

Base station 102, whether small cell 102' or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, a gndeb (gNB), or another type of base station. Some base stations (such as the gNB 180) may operate in the conventional below 6GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies to communicate with the UE 104. When the gNB 180 operates in millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. Millimeter-wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short distance. The base station 180 and the UE 104 may each include multiple antennas (such as antenna elements, antenna panels, and/or antenna arrays) to facilitate beamforming.

The base station 180 may transmit the beamformed signals to the UEs 104 in one or more transmit directions 182'. The UE 104 may receive the beamformed signals from the base station 180 in one or more receive directions 182 ". The UE 104 may also transmit the beamformed signals in one or more transmit directions to the base station 180. The base station 180 may receive the beamformed signals from the UEs 104 in one or more directions. The base stations 180/UEs 104 may perform beam training to determine the best reception and transmission direction for each of the base stations 180/UEs 104. The transmit direction and the receive direction for the base station 180 may be the same or may be different. The transmit direction and the receive direction for the UE 104 may be the same or may be different.

EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, serving gateway 166, MBMS gateway 168, broadcast multicast service center (BM-SC) 170, and Packet Data Network (PDN) gateway 172.MME 162 may communicate with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through the serving gateway 166, which serving gateway 166 itself is connected to the PDN gateway 172. The PDN gateway 172 provides IP address allocation as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to an IP service 176.IP services 176 may include the internet, intranets, IP Multimedia Subsystem (IMS), PS streaming services, and/or other IP services. The BM-SC 170 may provide functionality for MBMS user service setup and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting charging information related to eMBMS.

The core network 190 may include access and mobility management functions (AMFs) 192, other AMFs 193, session Management Functions (SMFs) 194, and User Plane Functions (UPFs) 195. The AMF 192 may communicate with a Unified Data Management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. In general, AMF 192 provides quality of service (QoS) flows and session management. All user Internet Protocol (IP) packets are transmitted through UPF 195. The UPF 195 provides UE IP address assignment as well as other functions. The UPF 195 is connected to an IP service 197. The IP services 197 may include internet, intranet, IMS, packet Switched (PS) streaming services, and/or other IP services.

A base station may include and/or be referred to as a gNB, a node B, eNB, an access point, a base station transceiver, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a transmit-receive point (TRP), or some other suitable terminology. The base station 102 provides an access point for the UE 104 to the EPC 160 or core network 190. Examples of UEs 104 include a cellular telephone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electricity meter, an air pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similarly functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meters, air pumps, ovens, vehicles, cardiac monitors, etc.). The UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, or some other suitable terminology.

Although the present disclosure may focus on 5G NR, the concepts and aspects described herein may be applicable to other similar fields, such as LTE, LTE-advanced (LTE-a), code Division Multiple Access (CDMA), global system for mobile communications (GSM), or other wireless/radio access technologies.

Referring again to FIG. 1, in some aspects, the base stations 102/180 may be configured to transmit a full Sounding Reference Signal (SRS) configuration indicating SRS bandwidth to the UE 104. The full SRS bandwidth may be the bandwidth of interest over which the UE 104 communicates with the base station 102/180, and thus, the full SRS bandwidth may be less than the entire system bandwidth (although the full SRS bandwidth may potentially be equal to the entire system bandwidth). The base station 102/180 may be configured to receive the SRS transmission from the UE 104 and based on the SRS configuration according to a frequency hopping pattern limited to a partial SRS bandwidth that is less than the full SRS bandwidth (198).

Accordingly, the UE 104 may be configured to receive SRS configuration from the base station 102/180 indicating full SRS bandwidth. The UE 104 may also be configured to determine a frequency hopping pattern for SRS transmission based on the SRS configuration, the frequency hopping pattern being limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth. Accordingly, the UE 104 may send SRS transmissions to the base station 102/180 based on a frequency hopping pattern that is limited to a partial SRS bandwidth that is less than the full SRS bandwidth (198).

Fig. 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Fig. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Fig. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Fig. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be Frequency Division Duplex (FDD) (where subframes within a set of subcarriers are dedicated to DL or UL for a particular set of subcarriers (carrier system bandwidth), or Time Division Duplex (TDD) (where subframes within a set of subcarriers are dedicated to both DL and UL for a particular set of subcarriers (carrier system bandwidth), in the example provided by fig. 2A, 2C, the 5G NR frame structure is assumed to be TDD, where subframe 4 is configured with a slot format 28 (where most is DL), where D is DL, U is UL, and F is flexibly used between DL/UL, and subframe 3 is configured with a slot format 34 (where most is UL), although subframes 3,4 are shown as having slot formats 34, 28, respectively, any particular subframe may be configured with any of various available slot formats 0-61.

Other wireless communication technologies may have different frame structures and/or different channels. A frame (e.g., of 10 milliseconds (ms)) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more slots. The subframe may also include a minislot, which may include 7, 4, or 2 symbols. Each slot may comprise 7 or 14 symbols depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be Cyclic Prefix (CP) Orthogonal Frequency Division Multiplexing (OFDM) (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) -spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to single stream transmission). The number of slots within a subframe may be based on a slot configuration and a digital scheme (numerology). For slot configuration 0, different digital schemes μ0 to 4 allow 1,2, 4, 8 and 16 slots per subframe, respectively. For slot configuration 1, different digital schemes 0 to 2 allow 2, 4 and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and digital scheme μ, there are 14 symbols/slot and 2^μ slots/subframe. The subcarrier spacing and symbol length/duration are functions of the digital scheme. The subcarrier spacing may be equal to 2 μ×15 kilohertz (kHz), where μ is a digital scheme 0 to 4. Thus, the digital scheme μ=0 has a subcarrier spacing of 15kHz, and the digital scheme μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing. Fig. 2A-2D provide examples of slot configuration 0 (with 14 symbols per slot) and digital scheme μ=2 (with 4 slots per subframe). The slot duration is 0.25ms, the subcarrier spacing is 60kHz and the symbol duration is approximately 16.67 mus. Within the frame set, there may be one or more different bandwidth portions (BWP) of the frequency division multiplexing (see fig. 2B). Each BWP may have a specific digital scheme.

The resource grid may be used to represent a frame structure. Each slot includes Resource Blocks (RBs) (also referred to as Physical RBs (PRBs)), which include 12 consecutive subcarriers. The resource grid is divided into a plurality of Resource Elements (REs). The number of bits carried by each RE depends on the modulation scheme.

As shown in fig. 2A, some of the REs carry a reference (pilot) signal (RS) for the UE. The RSs may include demodulation RSs (DM-RSs) for channel estimation at the UE (indicated as R_x for one particular configuration (where 100x is a port number), but other DM-RS configurations are possible) and channel state information reference signals (CSI-RSs). The RSs may also include beam measurement RSs (BRSs), beam Refinement RSs (BRRSs), and phase tracking RSs (PT-RSs).

Fig. 2B shows an example of various DL channels within a subframe of a frame. A Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in one OFDM symbol. The PDCCH within one BWP may be referred to as a control resource set (CORESET). Additional BWP may be located at a larger and/or lower frequency across the channel bandwidth. The Primary Synchronization Signal (PSS) may be within symbol 2 of a particular subframe of a frame. PSS is used by the UE 104 to determine subframe/symbol timing and physical layer identity. The Secondary Synchronization Signal (SSS) may be within symbol 4 of a particular subframe of a frame. SSS is used by the UE to determine the physical layer cell identification group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine a Physical Cell Identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS as described above. A Physical Broadcast Channel (PBCH) carrying a Master Information Block (MIB) may be logically grouped with PSS and SSS to form a Synchronization Signal (SS)/PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and a System Frame Number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information, such as System Information Blocks (SIBs), not transmitted over the PBCH, and paging messages.

As shown in fig. 2C, some of the REs carry DM-RS for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE may transmit DM-RS for a Physical Uplink Control Channel (PUCCH) and DM-RS for a Physical Uplink Shared Channel (PUSCH). PUSCH DM-RS may be transmitted in the previous or two symbols of PUSCH. The PUCCH DM-RS may be transmitted in different configurations according to whether a short PUCCH or a long PUCCH is transmitted and according to a specific PUCCH format used. The UE may transmit SRS. The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the combs. The SRS may be used by the base station for channel quality estimation to enable frequency dependent scheduling on the UL.

Fig. 2D shows examples of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries Uplink Control Information (UCI) such as a scheduling request, a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and hybrid automatic repeat request (HARQ) Acknowledgement (ACK)/non-acknowledgement (NACK) feedback. PUSCH carries data and may additionally be used to carry Buffer Status Reports (BSR), power Headroom Reports (PHR), and/or UCI.

Fig. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In DL, IP packets from EPC 160 may be provided to controller/processor 375. Controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a Radio Resource Control (RRC) layer, and layer 2 includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Medium Access Control (MAC) layer. Controller/processor 375 provides RRC layer functions associated with broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection setup, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement reporting, PDCP layer functions associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions, RLC layer functions associated with transmission of upper layer Packet Data Units (PDUs), error correction by ARQ, concatenation of RLC Service Data Units (SDUs), segmentation and reassembly, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs, and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto Transport Blocks (TBs), de-multiplexing of MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, prioritization, and logical channel prioritization.

The Transmit (TX) processor 316 and the Receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1, which includes a Physical (PHY) layer, may include error detection of a transmission channel, forward Error Correction (FEC) encoding/decoding of the transmission channel, interleaving, rate matching, mapping onto a physical channel, modulation/demodulation of the physical channel, and MIMO antenna processing. TX processor 316 processes the mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The encoded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying the time domain OFDM symbol stream. The OFDM streams are spatially precoded to produce a plurality of spatial streams. The channel estimates from the channel estimator 374 may be used to determine the coding and modulation scheme and for spatial processing. The channel estimate may be derived from reference signals and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to a Receive (RX) processor 356.TX processor 368 and RX processor 356 implement layer 1 functions associated with various signal processing functions. RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for UE 350. If multiple spatial streams are destined for the UE 350, they may be combined into a single OFDM symbol stream by the RX processor 356. RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to a controller/processor 359, the controller/processor 359 implementing layer 3 and layer 2 functions.

The controller/processor 359 can be associated with a memory 360 that stores program codes and data. Memory 360 may be referred to as a computer-readable medium. In the UL, controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with DL transmissions by the base station 310, the controller/processor 359 provides RRC layer functions associated with system information (e.g., MIB, SIB) acquisition, RRC connection and measurement reporting, PDCP layer functions associated with header compression/decompression and security (ciphering, deciphering, integrity protection, integrity verification), RLC layer functions associated with upper layer PDU delivery, error correction by ARQ, concatenation, segmentation and reassembly of RLC SDUs, re-segmentation of RLC data PDUs and re-ordering of RLC data PDUs, and MAC layer functions associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, de-multiplexing of MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, priority handling and logical channel prioritization.

Channel estimates derived by channel estimator 358 from reference signals or feedback transmitted by base station 310 may be used by TX processor 368 to select appropriate coding and modulation schemes, as well as to facilitate spatial processing. The spatial streams generated by TX processor 368 may be provided to different antenna 352 via separate transmitters 354 TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

UL transmissions are handled at the base station 310 in a similar manner as described in connection with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its corresponding antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

The controller/processor 375 may be associated with a memory 376 that stores program codes and data. Memory 376 may be referred to as a computer-readable medium. In the UL, controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from UE 350. IP packets from controller/processor 375 may be provided to EPC 160. Controller/processor 375 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

In some aspects, at least one of TX processor 368, RX processor 356, and/or controller/processor 359 may be configured to perform aspects related to (198) of fig. 1.

In some other aspects, at least one of TX processor 316, RX processor 370, and/or controller/processor 375 may be configured to perform the various aspects related to (198) of fig. 1.

Fig. 4 is a diagram 400 of an example configuration of SRS resources. In an access network of an example RAT, such as a 5G NR access network, a base station may use at least one SRS, which may be referred to as SRS resources (although SRS resources do not necessarily correspond to only one subcarrier or RE on one symbol), to estimate at least one channel (e.g., an uplink channel) on which to receive transmissions from a UE. Additionally or alternatively, SRS may be used for uplink frequency selective scheduling and/or uplink timing estimation. Thus, the UE transmits at least one SRS to the base station (e.g., see fig. 2C-2D above), albeit potentially over a wider bandwidth than the uplink channel. The UE may probe all ports of the SRS resource in each symbol of the SRS resource.

According to various aspects, the slot 402 may be configured to include SRS over a set of RBs across the entire bandwidth of interest for the base station and UE. Potentially, the entire bandwidth of interest may be the uplink bandwidth of interest. The bandwidth of interest may be less than the entire system bandwidth, but the bandwidth of interest may potentially be equal to the entire system bandwidth. For example, the bandwidth of interest may be 36, 48, or 64 RBs (although different numbers of RBs are possible for different bandwidths of interest). In some aspects, the UE may be configured to transmit SRS over the entire bandwidth of interest. Thus, in the present disclosure, the entire bandwidth of interest may also be referred to as the "full SRS bandwidth.

The base station may configure the entire bandwidth of interest and, thus, the base station may signal the full SRS bandwidth to the UE, e.g., as part of SRS configuration. In some aspects, the base station may signal the full SRS bandwidth and/or other information associated with the SRS configuration to the UE via RRC signaling. In some other aspects, the base station may signal the full SRS bandwidth and/or other SRS configuration information using DCI (e.g., information included in the DCI and/or DCI format) and/or a MAC Control Element (CE).

In the time domain, slot 402 may be configured to support SRS resources that span a certain number of symbols, which may be contiguous (e.g., 1, 2, or 4 contiguous symbols), with up to 4 ports per SRS resource. According to some aspects, SRS may be transmitted only in the last 6 symbols of slot 402 (e.g., 5G NR version 15 and version 16 may support SRS transmission in the last 6 symbols of the slot). However, according to some other aspects, SRS may be transmitted in any symbol of a slot (e.g., 5G NR version 17 and higher may potentially support SRS transmission in more or all symbols of slot 402).

Additionally or alternatively, SRS may only be transmitted in a slot after uplink data for that slot (such as uplink data carried on PUSCH). For example, PUSCH may be mapped to a subset of symbols 0 through 13 of slot 402. Next, the SRS may be mapped to a subset of the remaining symbols 8 through 13 of the slot 402, e.g., the SRS may be mapped to 1, 2, or 4 adjacent symbols within the symbols 8 through 13 of the slot 402.

When a UE transmits SRS resources, the SRS resources may be included in an SRS resource set of the UE, such as SRS resource set 1 410a or SRS resource set 2410 b. The SRS resource set may be configured to include one SRS resource or a set of multiple SRS resources, where the SRS resources included are based on use cases of transmitting SRS, such as antenna switching, codebook-based, non-codebook-based, beam management, and the like. Further, the UE may be configured for aperiodic, semi-persistent, or periodic transmission of the SRS resource set, e.g., where the aperiodic transmission of the SRS resource set is signaled from the base station to the UE via DCI.

Illustratively, for SRS antenna switching use cases, 1 or 2TX to 2 or 4RX antenna switching may be supported, which may be denoted as "1T2R", "2T4R", "1T4R" and "1T4R/2T4R", where the UE supports both 1TX to 4RX antenna switching and 2TX to 4RX antenna switching (however, an equal number of antenna switching of TX and RX may also be supported). To support antenna switching, the SRS resource set is configured with two (for 1T2R or 2T 4R) or four (for 4T 4R) SRS resources transmitted in different symbols. Each SRS resource includes one (for 1T2R or 1T 4R) or two (for 2T 4R) antenna ports, and the SRS ports of each SRS resource are associated with different UE antenna ports.

As shown in one example of fig. 4, SRS resource set 1 410a is 1T 4R-based and thus includes four SRS resources 1 through 4 412a-d. The four SRS resources 1 through 4 412a-d may occur in one slot, such as within four adjacent symbols of symbols 8 through 13 of slot 402. However, other configurations may also be supported. For example, for 1T4R, instead of SRS resources 1 to 4 412a-d in one slot, two aperiodic SRS resource sets with a total of four SRS resources transmitted in different symbols of two different slots may be configured.

As shown in another example of fig. 4, SRS resource set 2 410b may be based on a use case of codebook-based transmission (e.g., for beamforming), such as when feedback of precoding information (e.g., PMI) and/or other information is configured to increase throughput at the receiver side (e.g., base station). The SRS resource set 2 410b may include one SRS resource 5 412e based on codebook-based transmission. The SRS resource 5 412e may be transmitted in a single symbol (e.g., one of symbols 8 through 13 of the slot 402), and thus, the SRS resource 5 412e may be wideband in that the SRS resource 5 412e may span the full SRS bandwidth.

Fig. 5 is a diagram 500 of an example frequency hopping for SRS transmission. As described above, the SRS resource set may span the full SRS bandwidth. For example, one SRS resource may span the full SRS bandwidth such that the full SRS bandwidth may be probed on one symbol. However, the set of SRS resources may not span the full SRS bandwidth in the symbol, but rather the set of SRS resources may include one or more SRS resources that span the full SRS bandwidth across multiple symbols.

To this end, the UE may be configured to use frequency hopping for the SRS resource set. For example, the UE may not have sufficient transmission power to probe over the full SRS bandwidth (e.g., when the UE is near the cell edge), and thus, the base station may configure the UE to use frequency hopping for SRS transmissions. However, when frequency hopping is used, the UE may still transmit SRS over the full SRS bandwidth, but may do so over multiple symbols (e.g., multiple adjacent symbols).

According to the example shown in fig. 5, the full SRS bandwidth (or sounding bandwidth) may be configured to 48 PRBs. The UE may probe over the full SRS bandwidth according to different SRS hopping patterns 502, 522, 542. The SRS resources may be transmitted at each hop, where each hop spans a fractional number of full SRS bandwidths over one symbol (e.g., half or a quarter of the full SRS bandwidth).

For example, in the first SRS hopping pattern 502, SRS resources 504 can be transmitted on two adjacent symbols 12 and 13 of at least one slot. Each of the SRS resources 504 may span 24 PRBs of a different half of the full SRS bandwidth such that all 48 PRBs in the full SRS bandwidth are probed on two adjacent symbols.

In an example of the second SRS hopping pattern 522, the SRS resources 504 can be transmitted on four adjacent symbols 10 to 13 of at least one slot. The SRS resources 504 may span 12 PRBs of different quarter of the full SRS bandwidth such that all 48 PRBs in the full SRS bandwidth are probed on four adjacent symbols.

In an example of the third SRS hopping pattern 542, the SRS resources 504 can be transmitted on four adjacent symbols 10 to 13 of at least one slot. The SRS resource 504 may span 24 PRBs of the full SRS bandwidth. However, unlike the first two SRS hopping patterns 502, 522, SRS resources may be repeated. For example, SRS resource 504 may be repeated on symbols 10 and 11, and SRS resource 504 may be repeated on symbols 12 and 13. Such repetition may increase the effectiveness of the detection over each 24PRB bandwidth, e.g., detecting only each half or quarter of the 48PRB bandwidth once per symbol.

In some scenarios, transmission of SRS resource sets that span the full SRS bandwidth may be unnecessary and/or inefficient (e.g., in terms of power overhead). For example, sounding over only a portion of the full SRS bandwidth may be sufficient for some channel estimation, uplink timing alignment, and/or uplink frequency selective scheduling of the base station. Additionally or alternatively, the UE may operate within power constraints that prevent the UE from sounding the full SRS bandwidth, such as when the UE has insufficient remaining battery charge, or when the UE is configured as a low power device capable of relatively lower transmission power than other UEs. In other examples, the base station may provide a cell in which the number of transmitting UEs exceeds the uplink resources available for SRS transmission without requiring some additional multiplexing mechanism. Thus, there is a need for a method for SRS transmission over less than the full SRS bandwidth.

The present disclosure (and in particular fig. 6-12) describes various techniques and solutions for SRS transmission using only a portion of the full SRS bandwidth or a portion of the SRS bandwidth. Such techniques and solutions for SRS transmission using a portion of the SRS bandwidth may allow UEs to multiplex such that a greater number of UEs can transmit SRS in a cell. Furthermore, SRS transmission using a portion of the SRS bandwidth may reduce some power overhead, such as power overhead caused by the UE transmitting from the SRS and/or the base station receiving from the SRS.

In fig. 6-12, some techniques and solutions for SRS transmission using a partial SRS bandwidth are provided by a sounding mode (e.g., a frequency hopping mode) that uses only a partial SRS bandwidth, which may be a fractional number of full SRS bandwidths. Some other solutions for SRS transmission using a partial SRS bandwidth are provided in fig. 6-12 by generating various SRS sequences configured for use with a partial SRS bandwidth that is less than the full SRS bandwidth.

Referring to fig. 6, a call flow diagram 600 illustrates various operations for SRS transmission using a portion of an SRS bandwidth that is less than a full SRS bandwidth. In fig. 6, a base station 602 may be configured to provide a cell on which a plurality of UEs 604a-b operate. For example, referring to fig. 1 and 3, the base station 602 may be implemented as a base station 102/180, 310 and each of the UEs a-b may be implemented as a UE 104, 350.

Each of the UEs 604a-b may be configured to transmit data and/or control information to the base station 602. Transmissions in such directions may be considered as uplinks. Uplink data may be carried on an uplink data channel such as PUSCH. The base station 602 may configure PUSCH transmissions for each of the UEs 604a-b on respective active BWP, which may be updated by the base station 602.

To improve the accuracy and success of decoding the uplink data received from the UEs 604a-b, the base station 602 may perform channel estimation, e.g., to model current channel conditions, in order to reliably receive uplink data from the UEs 604a-b at high data rates. Channel estimation may be performed over an entire bandwidth of interest, which may be greater than any one active BWP (e.g., the entire bandwidth of interest for UEs 604a-b may be the entire bandwidth spanned by all BWP that may potentially be activated by base station 602 for UEs 604 a-b).

Each of the UEs 604a-b may be able to probe over a bandwidth by transmitting a set of SRS resources including one or more SRS resources. For example, each of the UEs 604a-b may detect all SRS ports in one or more symbols of the SRS resource set. In some aspects, at least one of the UEs 604a-b may probe over the entire bandwidth of interest or the full SRS bandwidth by transmitting a set of SRS resources that includes one or more SRS resources spanning the full SRS bandwidth in an aggregation. However, in some other aspects, at least one of the UEs 604a-b may probe over a fractional number of the entire bandwidth of interest or a portion of the SRS bandwidth that is less than the full SRS bandwidth by transmitting a set of SRS resources that includes one or more SRS resources that span the portion of the SRS bandwidth instead of the full SRS bandwidth.

The base station 602 can configure the UEs 604a-b for sounding by transmitting SRS configuration information 622a-b to the UEs 604 a-b. In some aspects, each of the SRS configuration information 622a-b may be configured separately for each of the UEs 604 a-b. Thus, the base station 602 may transmit to the first UE 604a first SRS configuration information 622a that is different from the second SRS configuration information 622b transmitted by the base station 602 to the second UE 604 b.

According to various aspects, each of SRS configuration information 622a-b may include and/or indicate any information associated with SRS transmissions. Each of SRS configuration information 622a-b may be transmitted in one or more messages, which may be signaled in the same or different types or formats (such as RRC signaling, DCI, and/or MAC CE). For example, the base station 602 can signal the first UE 604a with RRC signaling, DCI, and MAC CE at respective times such that a first portion of the first SRS configuration information 622a is signaled via RRC signaling at time t, a second portion of the first SRS configuration information 622a is signaled via DCI at time t+x, and a third portion of the first SRS configuration information 622a is signaled via MAC CE at time t+y.

The base station 602 may configure the entire bandwidth of interest, also referred to as the "full SRS bandwidth," for each of the UEs 604 a-b. The base station 602 may transmit information indicating the full SRS bandwidth to each of the UEs 604a-b in a respective one of the first and second SRS configuration information 622 a-b. For example, the base station 602 may indicate the full SRS bandwidth via RRC signaling, but according to other aspects the full SRS bandwidth may be configured via DCI or MAC CE.

In the same or different message, base station 602 can include a period or duration for SRS transmission in at least one of SRS configuration information 622 a-b. The period (or duration) may indicate whether the SRS transmission is periodic or aperiodic, or potentially semi-persistent.

In some aspects, the SRS transmission period may be configured to be aperiodic via RRC signaling, but the base station 602 may activate SRS transmission from one of the UEs 604a-b via DCI. In some other aspects, SRS transmission periods may be configured to be periodic via RRC signaling, and such RRC signaling may also configure the number of ms of periods and the subframe offset of the periods.

In addition, base station 602 can include a frequency domain location in at least one of SRS configuration information 622a-b that defines a starting location of SRS transmission in the frequency domain. For example, the frequency domain position (e.g., labeled freqdomain position) may have a value of an index of the lowest RB (or PRB) that the SRS transmission is to span.

As described above with respect to fig. 2C, SRS transmission may not occur on every subcarrier of an RB (or PRB). Instead, SRS resources may be mapped to every other subcarrier of an RB in the transmission comb structure, starting with the first (e.g., lowest) subcarrier or the second (e.g., next successive after lowest).

Thus, the base station 602 can include a value of the transmit comb (e.g., labeled transmissionComb) in at least one of the SRS configuration information 622 a-b. The transmit comb value may configure one of the UEs 604a-b to transmit on each even subcarrier (e.g., transmit comb 0 starting with subcarrier index 0) or each odd subcarrier (e.g., transmit comb 1 starting with subcarrier index 1).

To maintain orthogonality, the base station 602 can include in at least one of the SRS configuration information 622a-b a value to be applied to the cyclic shift of SRS transmission by one of the UEs 604 a-b. For example, the cyclic shift value (e.g., labeled CYCLICSHIFT) may include a value between 1 and 8 (including 1 and 8) (although more, fewer, or different values are also possible). Illustratively, when the UEs 604a-b share the same full SRS bandwidth according to the SRS configuration information 622a-b, the SRS transmissions of the UEs 604a-b may be multiplexed in the full SRS bandwidth because the respective different cyclic shifts will remain orthogonal.

According to some aspects, base station 602 can include a bandwidth of SRS resources of the SRS resource set in at least one of SRS configuration information 622 a-b. For example, the SRS resource Bandwidth (e.g., labeled SRS-Bandwidth) may indicate a number of RBs (or PRBs) to be spanned by each of the one or more SRS resources configured to be included in at least one of the UEs 604 a-b.

Relatedly, the base station 602 can include information (e.g., labeled SRS-HoppingBandwidth) configuring a hop bandwidth for SRS transmission in at least one of the SRS configuration information 622 a-b. That is, the SRS hopping bandwidth may be a number of consecutive RBs (or PRBs) starting from a frequency domain location that span the entire bandwidth of interest. Thus, in some aspects, the SRS hopping bandwidth may be equal to the full SRS bandwidth.

At least one of the SRS configuration information 622a-b may include a respective value for each of the SRS resource bandwidth and the SRS hopping bandwidth. The respective values may implicitly indicate respective numbers of RBs (or PRBs) to be spanned by each of the SRS resource bandwidth and the SRS hopping bandwidth. For example, each of the respective values may be associated with a respective table (e.g., a look-up table) or similar keyed or indexed data structure, which may be (pre) configured in at least one of the UEs 604 a-b.

Each of the respective values may correspond to a row, column, or other entry of an associated table, and the number of RBs (or PRBs) configured for SRS resource bandwidth or SRS hopping bandwidth may be explicitly or implicitly included in the row, column, or other entry corresponding to the respective value indicated in at least one of SRS configuration information 622 a-b.

By way of illustration, the first SRS configuration information 622a may include a value of an SRS resource bandwidth of bw3 and may further include a value of an SRS hopping bandwidth of hbw 0. The first UE 604a may identify a row, column, or other entry of at least one table corresponding to bw3 and may derive from the corresponding row, column, or other entry a number of RBs (or PRBs) configured to be spanned by each SRS resource, e.g., the SRS resource bandwidth may be equal to 4. Similarly, the first UE 604a may identify a row, column, or other entry of at least one table corresponding to hbw a, and may derive from the corresponding row, column, or other entry a number of RBs (or PRBs) of all bandwidths of interest (e.g., full SRS bandwidth) of the configuration, e.g., SRS hopping bandwidth may be equal to 48.

According to some aspects, at least one of the UEs 604a-b may determine whether to enable or disable SRS hopping based on information implicitly signaled in a respective one of the SRS configuration information 622 a-b. In particular, at least one of the UEs 604a-b may derive an enabled or disabled state of SRS hopping from a combination of respective values configured for SRS resource bandwidth and SRS hopping bandwidth.

For example, SRS hopping may be enabled when at least one of SRS configuration information 622a-b includes a value (e.g., hbw0, hbw1, hbw2, or hbw 3) of SRS hopping bandwidth configured to be less than a value (e.g., bw0, bw1, bw2, or bw 3) of SRS resource bandwidth. However, when at least one of SRS configuration information 622a-b includes a value (e.g., hbw0, hbw1, hbw2, or hbw 3) of SRS hopping bandwidth configured to be greater than or equal to a value (e.g., bw0, bw1, bw2, or bw 3) of SRS resource bandwidth, then SRS hopping may be disabled. Thus, as shown in the foregoing description, SRS hopping is enabled for the first UE 604a because bw3 SRS resource bandwidth is greater than the SRS hopping bandwidth of hbw a. In practice, the first UE 604a may then hop over 48 RB bandwidths configured for SRS hopping bandwidths (e.g., full SRS bandwidth) using 4 RBs configured for each SRS resource (e.g., symbol).

In some aspects, at least one of the UEs 604a-b may be configured for SRS hopping over a full SRS bandwidth. For example, the second UE 604b may be configured for SRS hopping over the full SRS bandwidth. Accordingly, the SRS resources in the SRS resource set configured for the second UE 604b may span the full SRS bandwidth over one or more symbols.

Referring to fig. 7, for example, a diagram 700 illustrates a full SRS bandwidth hopping pattern 702. By way of illustration, the full SRS bandwidth may be configured to span 16x RBs (e.g., 12 subcarriers per RB). In one example aspect, x may be equal to 4 RBs, and thus, the full SRS bandwidth may be equal to 64 RBs (e.g., 768 subcarriers, with 12 subcarriers per RB). However, in some other aspects, x may be different (e.g., greater than) 4.

The second UE 604b may be configured with SRS resources 704. The SRS bandwidth for the second UE 604b may be equal to 16 RBs and the SRS hopping bandwidth may be equal to 64 RBs. Accordingly, the second UE 604b may transmit SRS resources 704 on a respective (unique) 16RB bandwidth on a respective one of the symbol indexes 10 to 13, and thus, the second UE 604b may probe on the full 64RB bandwidth.

In order for SRS resources 704 to span a respective portion of the full SRS bandwidth, an SRS hopping pattern for the full SRS bandwidth may be configured. The SRS hopping pattern can define a respective hopping bandwidth (e.g., a set of contiguous RBs) for each hop, where each hop occurs at a respective symbol of at least one slot.

In the context of fig. 7, for example, the full SRS bandwidth hopping pattern may define a unique 16RB bandwidth (e.g., assuming x=4) for each hop at a respective one of symbols 10 through 13. Thus, the second UE 604b transmits SRS on the first 16 RBs of the full SRS bandwidth at the first transition of symbol 10. At the next hop on symbol 11, the second UE 604b starts transmitting SRS on 16 RBs starting after the first 32 RBs of the full SRS bandwidth (e.g., from subcarrier index 383 to subcarrier index 575 where for x=4 RBs, the subcarrier indexes are from 0, 1, 2., 765, 766, 768). At the third transition on symbol 12, the second UE 604b transmits SRS on 16 RBs starting after the first 16 RBs of the full SRS bandwidth and ending with the 32 th RB. At the last hop on symbol 13, the second UE 604b starts after the first 48 RBs of the full SRS bandwidth and transmits SRS on 16 RBs ending with the last (64 th) RB. Thus, since SRS resource 704 spans all RBs of the full SRS bandwidth over four symbol hops occurring at symbols 10 through 13, SRS resource 704 probes the full SRS bandwidth.

Referring again to fig. 6, at least one of the ues 604a-b may be configured to use an SRS hopping pattern that uses only a portion of the full SRS bandwidth, i.e., a portion of the SRS bandwidth that is less than the full SRS bandwidth. In practice, at least one of the UEs 604a-b may be configured with SRS resources in a set of SRS resources that span a portion of the SRS bandwidth rather than the full SRS bandwidth. Probing over a portion of the SRS bandwidth that is less than the full SRS bandwidth may be more efficient (e.g., in terms of power overhead and/or UE capacity) while still being sufficient for channel estimation, uplink frequency selective scheduling, uplink timing estimation, etc. by the base station 602.

However, to transmit SRS resources, the UEs 604a-b may generate 624, 626SRS sequences. In some aspects, SRS sequence generation may be based on SRS configuration information. For example, the first UE 604a may generate 624 the SRS sequence based on at least one of a full SRS bandwidth (e.g., SRS hopping bandwidth), an SRS bandwidth, a starting frequency location, a transmission comb, and/or one or more other parameters indicated in the SRS configuration information 622 a. The first UE 604a may be configured (e.g., preconfigured) with a function or other algorithm that takes as input one or more of the above parameters and returns as output the SRS sequence according to an evaluation of the function/algorithm with the input parameters.

Although the SRS sequences may be generated based on the full SRS bandwidth, one of the UEs 604a-b may be configured to truncate the SRS sequences when transmitting SRS over a portion of the SRS bandwidth. For example, the first UE 604a may generate the SRS sequence based on the full SRS bandwidth configured by the base station 602, but may avoid mapping sub-sequences of the SRS sequence to those resources (e.g., REs) outside of the partial SRS bandwidth. The sub-sequence may map to a portion of the full SRS bandwidth outside of the partial SRS bandwidth on one or more omitted symbol hops, and the truncated SRS sequence may be carried on one or more other symbol hops on a portion of the full SRS bandwidth included in the partial SRS bandwidth.

In some other aspects, the SRS sequence generation may be based on a partial SRS bandwidth that may be indicated by at least one of the SRS configuration information 622a-b for at least one of the UEs 604a-b supporting SRS transmission over the partial SRS bandwidth. For example, the first UE 604a may generate 624 the SRS sequence based at least on a portion of the SRS bandwidth and potentially further based on at least one of a full SRS bandwidth (e.g., SRS hopping bandwidth), SRS bandwidth, starting frequency location, transmission comb, and/or one or more other parameters indicated in the SRS configuration information 622 a. The first UE 604a may be configured (e.g., preconfigured) with a function or other algorithm that takes at least a portion of the SRS bandwidth (e.g., the number and/or location of RBs included in the portion of the SRS bandwidth) as input and returns the SRS sequence as output according to an evaluation of the function/algorithm with the input parameters.

Potentially, not all UEs may support SRS transmission over a portion of the SRS bandwidth (e.g., some legacy UEs may lack such support). Thus, at least one cyclic shift may be used for SRS sequences based on the partial SRS bandwidth. The at least one cyclic shift may be different from another cyclic shift for another SRS sequence based on the full SRS bandwidth, e.g., a different cyclic shift per subband may be used. The different cyclic shifts for SRS transmission over the partial and full SRS bandwidths may reduce interference on the partial SRS bandwidth by UEs transmitting SRS to UEs transmitting SRS in the full SRS bandwidth (e.g., legacy UEs).

In other aspects, the new SRS sequence may be configured for use over a portion of the SRS bandwidth. When such a new SRS sequence is transmitted over a portion of the SRS bandwidth, the new SRS sequence may be orthogonal to another SRS sequence (e.g., a legacy generation of SRS sequences) generated based on (and transmitted over) the full SRS bandwidth. For example, the first UE 604a may generate 624 a new SRS sequence configured for use over a portion of the SRS bandwidth that is less than the full SRS bandwidth.

In conjunction with generating the respective SRS sequences, each of the UEs 604a-b may determine 628, 630 a respective frequency hopping pattern for SRS transmission. At least one of the UEs 604a-b may determine an SRS hopping pattern for a portion of the SRS bandwidth that is less than the full SRS bandwidth. Further, the respective partial SRS bandwidth hopping patterns may be periodic, aperiodic, or semi-persistent, e.g., as indicated according to one of SRS configuration information 622 a-b. In some aspects, at least one of the UEs 604a-b may determine 628, 630 a respective partial SRS bandwidth hopping pattern based at least in part on a respective one of the generated SRS sequences.

In some other aspects, the base station 602 may configure at least one of the UEs 604a-b with a respective SRS hopping pattern, and thus, at least one of the UEs 604a-b may determine 628, 630 the respective SRS hopping pattern according to the configuration received from the base station 602. For example, the base station 602 can transmit to each of the UEs 604a-b a respective one of the SRS configuration information 622a-b indicating a partial bandwidth (e.g., number and location of RBs) over which to transmit SRS resources at each hop, where each hop occurs over one symbol in a set of adjacent symbols.

In various further aspects, the base station 602 can implicitly indicate a respective SRS hopping pattern to at least one of the UEs 604 a-b. Thus, at least one of the UEs 604a-b may determine (e.g., calculate, derive, etc.) a respective bandwidth location (e.g., a starting frequency location, a starting RB location, an ending frequency location, etc.) corresponding to each symbol transition for SRS resource transmission.

In further aspects, at least one of the UEs 604a-b may determine an SRS hopping pattern for the full SRS bandwidth (e.g., based on a respective one of the SRS configuration information 622 a-b). At least one of the UEs 604a-b may then determine a partial SRS bandwidth hopping pattern by determining a portion of the SRS transmission to be omitted. For example, at least one of the UEs 604a-b may determine a hopping pattern for the full SRS bandwidth, but may then determine the hopping pattern for the partial SRS bandwidth by determining to avoid SRS transmission over some portion of the full SRS bandwidth.

When determined, the SRS hopping pattern for the partial SRS bandwidth can define at least one of (1) a subset of the set of RBs for each symbol (e.g., each hop) in the set of symbols (e.g., the set of hops) for SRS transmission, and/or (2) a subset of the set of symbols for SRS transmission for SRS resources in the set of SRS resources. In practice, at least one of the UEs 604a-b may refrain from transmitting SRS resources on one or more RBs of the at least one symbol transition of the partial SRS transition pattern and/or refrain from transmitting SRS resources at the one or more symbol transitions of the partial SRS transition pattern (e.g., such that all RBs of the one or more symbol transitions are skipped).

Referring to fig. 8, for example, a diagram 800 illustrates example partial SRS bandwidth hopping patterns 802, 822, 842. According to the partial SRS bandwidth hopping patterns 802, 822, 842 of fig. 8, each hopped frequency resource (e.g., RB) can be divided into N sub-resources (or "sub-hops"). Thus, SRS transmission for one UE will occur only on one of the N sub-resources into which the resources for each hop are divided. For example, SRS transmission for one UE will occur only on a subset of the set of 4x RBs per symbol transition. Effectively, the hopping on each symbol hop can be considered an outer loop, and a partial SRS hopping pattern can be introduced into the inner loop such that one UE hops to only one of the N sub-resources into which the resource of each symbol hop is divided. Potentially, the frequency resources (e.g., N sub-resources) per sub-hop may be greater than 4 RBs or may be greater than or equal to 4 RBs (although other numbers of frequency resources are possible).

In some aspects, the ratio of sub-hopping frequency resources to hopping frequency resources can be configured based on a threshold (e.g., a predefined threshold). For example, the ratio of sub-hopping frequency resources to hopping frequency resources may be constrained within a threshold. Illustratively, the threshold may be equal to 1/2, and the base station 602 may divide the 4x RBs per hop into 4 sub-hops, 1 RB per sub-hop, such that the ratio of sub-hop frequency resources to hop frequency resources is 1/4, which is within the threshold of 1/2.

According to some aspects illustrated by the first portion SRS bandwidth hopping pattern 802, each of the sub-hops of the symbol hops includes the same number of resources, e.g., each of the symbol hops includes x RBs, and further, each of the hops has the same number of sub-hops, e.g., each hop has 4 sub-hops. For example, each symbol transition may include 4x RBs, where x may be equal to 4 or x may be greater than 4 (although other values are possible). The 4x RBs of each symbol transition may be divided into sub-transitions of (4 x)/(N) RBs, for example, if n=4, each transition may be uniformly divided into x RBs.

According to some other aspects shown by the second portion SRS bandwidth hopping pattern 822, each of the sub-hops of the symbol hops includes the same number of resources, e.g., each of the symbol hops includes x RBs, but each of the hops does not have the same number of sub-hops, e.g., the hops at symbols 10 and 11 have 4 sub-hops and the hops at symbols 12 and 13 have 2 sub-hops. For example, each symbol transition may include 4x RBs, where x may be equal to 4 or x may be greater than 4 (although other values are possible). The hopped 4x RBs at symbols 10 and 11 may be divided into (4 x)/4 RBs or sub-hops of x RBs, and the hopped 4x RBs at symbols 12 and 13 may be divided into (4 x)/2 RBs or sub-hops of 2x RBs.

According to other aspects shown by the third portion SRS bandwidth hopping pattern 842, each of the sub-hops of some of the symbol hops includes a different number of resources, e.g., the hops at symbols 11 and 13 each include one sub-hop with 3x RBs and one sub-hop with x RBs, and further, each of the hops does not have the same number of sub-hops, e.g., the hops at symbols 10 and 12 have 4 sub-hops and the hops at symbols 11 and 13 have 2 sub-hops. For example, each symbol transition may include 4x RBs, where x may be equal to 4 or x may be greater than 4 (although other values are possible). The hopped 4x RBs at symbols 10 and 12 may be divided into (4 x)/4 RBs or sub-hops of x RBs, while the hopped 4x RBs at symbols 11 and 13 may be divided into one sub-hop of 4x RBs and another sub-hop of x RBs.

When at least one of the UEs 604a-b is configured with a partial SRS bandwidth hopping pattern that is limited to a subset of the set of RBs for at least one symbol transition for SRS transmission, the at least one of the UEs 604a-b may transmit SRS on only the subset of the set of RBs at the at least one symbol transition. Thus, at least one of the UEs 604a-b may avoid transmitting SRS on other RBs of the symbol hopping that are not included in the subset of RBs.

For example, the first UE 604a may be configured with a set of SRS resources including the first SRS 804a and the second UE 604b may be configured with a set of SRS resources including the second SRS 804 b. Then, for one of the partial SRS bandwidth hopping patterns 802, 822, 824, the first and second UEs 604a-b can then transmit the corresponding SRS 804a-b on only those RBs that are configured for one of the SRS 804a-b, respectively, per symbol hop.

Similarly, the third UE and the fourth UE may be configured to transmit the third SRS 804c and the fourth SRS 804d, respectively, according to one of the configurations of the partial SRS bandwidth hopping patterns 802, 822, 842. Thus, multiple UEs (e.g., up to four UEs) may be multiplexed at each symbol transition to probe over a portion of the SRS bandwidth.

The base station 602 may assign sub-hops of the symbol hops to the UEs for such multiplexing. Further, the base station 602 can configure to divide the resources into sub-hops for each hop and can assign the resources of each sub-hop to one of the UEs 604 a-b. The base station 602 can transmit such resource assignments in SRS configuration information 622a-b, e.g., via RRC signaling, DCI, and/or MAC CE.

Turning to fig. 9, as another example, a diagram 900 illustrates example partial SRS bandwidth hopping patterns 902, 922, 942. According to the partial SRS bandwidth hopping patterns 902, 922, 942 of fig. 9, the number of hops can be limited such that SRS transmission occurs only over a portion of the SRS bandwidth that is less than the full SRS bandwidth. When the number of symbol hops is limited, the UE 604a-b may still use the configured SRS symbols and the number of hops to determine 628, 630 the SRS hopping pattern. However, the UEs 604a-b may refrain from transmitting on a subset of the set of symbol transitions.

In some aspects, the partial SRS bandwidth hopping pattern may include a restriction on the full SRS bandwidth hopping pattern. The base station 602 can activate respective restrictions for each of the UEs 604a-b that limit symbol hopping over which each of the UEs 604a-b can transmit SRS904 a-b. The base station 602 can transmit such restrictions in the SRS configuration information 622a-b, e.g., via RRC signaling, DCI, and/or MAC CE.

For example, the restrictions may be configured for each of the UEs 604a-b according to a hopping pattern that indicates the symbol hops over which each of the UEs 604a-b will transmit and the other symbol hops over which each of the UEs 604a-b will avoid transmitting. For example, the base station 602 may send each of the UEs 604a-b a respective bitmap indicating the respective skip mode.

Illustratively, the base station 602 may send a first bitmap indicating [1, 0] to the first UE 604a, where a "1" indicates assigned hops and a "0" indicates unassigned hops. As shown in the first hopping pattern 902, the first UE 604a can then transmit SRS 904a over the set of RBs of the first and second hops at symbols 10 and 11, but can refrain from transmitting SRS over the third and fourth hops at symbols 12 and 13.

Similarly, the base station 602 may send a second bitmap indicating [0,1] to the second UE 604 b. As shown in the first hopping pattern 902, the second UE 604b can then transmit SRS 904b over the set of RBs of the third and fourth hops at symbols 12 and 13, but can refrain from transmitting SRS over the first and second hops at symbols 10 and 11.

In some aspects, the restriction (e.g., skip mode) may be periodic or cyclic. For example, the base station 602 can configure a frequency hopping pattern in which the first and second UEs 604a-b are multiplexed (e.g., as shown in patterns 902, 942) that can cycle through a frequency hopping pattern 922 in which only the first UE 604a transmits SRS904a on all 4x RBs for all symbol hops (e.g., the second UE 604b refrains from SRS transmission).

Continuing with fig. 10, as a third example, diagram 1000 illustrates example partial SRS bandwidth hopping patterns 1002, 1022. According to partial SRS bandwidth hopping patterns 1002, 1022 of fig. 10, hopping patterns in which SRS transmissions are limited to a subset of the set of RBs for at least one symbol hop (e.g., as shown at fig. 8) may be combined with hopping patterns in which the number of hops may be limited such that SRS transmissions occur only over a portion of the SRS bandwidth (e.g., as shown at fig. 9).

For example, the base station 602 can configure the skip mode to limit the hopping mode to some symbol hops, and potentially those symbol hops that are activated for SRS transmission can be constrained to a subset of the set of RBs for those symbol hops. The base station 602 may use the same signaling or may use different signaling to inform the UEs 604a-b of the skip mode and the subset of RBs (e.g., sub-hops). Accordingly, each of the SRS configuration information 622a-b can include one or more messages indicating a respective skip mode and a respective subset of RBs for symbol hopping of one of the UEs 604 a-b. The base station 602 may send one or more messages via RRC signaling, DCI, and/or MAC CE.

As shown in mode 1002, the base station 602 may configure the first UE 604a to transmit the SRS 1004a on a first x RB of the 4x RBs of each symbol transition that is activated. Similarly, the base station 602 can configure the second UE 604b to transmit the SRS 1004b on a second x RBs of the 4x RBs per symbol transition that is activated. However, the base station 602 may deactivate (or skip) hops at symbols 11 and 13 and, thus, neither the first UE 604a nor the second UE 604b may transmit on any RB of each hop at symbols 11 and 13.

However, in mode 1004, the base station 602 can configure the first UE 604a to transmit SRS 1004a on a first x RBs of the 4x RBs of each hop at symbols 10 and 12. Similarly, the base station 602 can configure the second UE 604b to transmit the SRS 1004b on a second x RBs of the 4x RBs of each hop at symbols 10 and 12. The base station 602 can deactivate (or skip) hops at symbols 11 and 13 for the second UE 604b such that the frequency hopping pattern 630 determined by the second UE 604b causes the second UE 604b to avoid SRS transmission on each hop at symbols 11 and 13. Conversely, the base station 602 can activate full hops at symbols 11 and 13 for the first UE 604a such that the hopping pattern determined 628 by the first UE 604a causes the first UE 604a to transmit the SRS 1004a on the individual hops at symbols 11 and 13.

The above modes described at fig. 8-10 are intended to be illustrative. Thus, other frequency hopping patterns may be configured in accordance with the present disclosure.

Based on the hopping patterns determined 628, 630, respectively, the UEs 604a-b may transmit SRS 632, 634, respectively. The transmitted SRS 632, 634 may include respectively generated 624, 626 sequences. However, neither the first SRS 632 nor the second SRS 634 may span the full SRS bandwidth (e.g., SRS hopping bandwidth), but may span only a subset of RBs at each symbol hop and/or may not be present in one or more symbol hops of one or more slots.

Fig. 11 is a flow chart 1100 of a method of wireless communication. The method may be performed by a UE (e.g., UE 104, 350, 604a, 604 b). According to various aspects, one or more of the illustrated operations may be transposed, omitted, and/or performed concurrently.

At 1102, the UE may generate a sequence for SRS transmission based on at least a portion of a full SRS bandwidth. In some aspects, the UE may generate a sequence based on the number of RBs of the full SRS bandwidth, and the UE may truncate the sequence for use in the partial SRS bandwidth. For example, the UE may assign a truncated portion of the sequence to each symbol in the subset of the set of symbols based on the frequency hopping pattern such that the SRS transmission includes each truncated portion of the sequence assigned to the subset of the set of symbols. In some other aspects, the UE may generate a sequence based on a number of RBs of a partial SRS bandwidth that is less than the full SRS bandwidth, and the SRS transmission may include the sequence. For example, the UE may generate the sequence based on one or more cyclic shifts, and the number of the one or more cyclic shifts may be based on the partial SRS bandwidth. In other aspects, the UE may generate sequences orthogonal to each overlapping sequence over a portion of the SRS bandwidth.

For example, referring to fig. 6, the first UE 604a may generate 624 a sequence for SRS 632 and/or the second UE 604b may generate 626 a sequence for SRS 634.

At 1104, the UE may receive SRS configuration information from the base station indicating at least a full SRS bandwidth. For example, referring to fig. 6, the first UE 604a may receive SRS configuration information 622a from the base station 602 indicating at least a full SRS bandwidth and/or the second UE 604b may receive SRS configuration information 622b from the base station 602 indicating at least a full SRS bandwidth.

At 1106, the UE may determine a frequency hopping pattern for SRS transmission based on the SRS configuration information and the frequency hopping pattern may be limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth. For example, the SRS configuration information may also indicate an RB set for each symbol in a set of symbols available for SRS transmission, and the frequency hopping pattern may be limited to at least one of a subset of the RB set or a subset of the set of symbols for each symbol. In some aspects, the ratio of the subset of RBs to the set of RBs for each symbol may be less than or equal to a threshold. In some other aspects, the respective subset of RBs of each symbol is different for at least two symbols in the set of symbols. In other aspects, the SRS configuration information also indicates a subset of RBs assigned to the UE. In some further aspects, the SRS configuration indicates a subset of the set of symbols assigned to (or activated for) the UE. In a still further aspect, the SRS configuration includes a bitmap having a first value corresponding to each symbol in a subset of the set of symbols assigned to the UE and having a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.

For example, referring to fig. 6, the first UE 604a may determine 628 a frequency hopping pattern for SRS transmission based on the SRS configuration information 622a and the frequency hopping pattern may be limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth and/or the second UE 604b may determine 630 a frequency hopping pattern for SRS transmission based on the SRS configuration information 622b and the frequency hopping pattern may be limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth. Referring to fig. 8-10, the first UE 604a and/or the second UE 604b may determine a frequency hopping pattern that is one of the frequency hopping patterns 802, 822, 842 of fig. 8, one of the frequency hopping patterns 902, 922, 942 of fig. 9, and/or one of the frequency hopping patterns 1002, 1022 of fig. 10.

At 1108, the UE may send SRS transmissions to the base station based on the frequency hopping pattern. The SRS transmission may include a generated sequence, which may be truncated or may be a new sequence based on a portion of the SRS bandwidth and/or orthogonal to other sequences overlapping over the portion of the SRS bandwidth.

For example, referring to fig. 6, the first UE 604a may transmit SRS 632 to the base station 602 based on the determined 628 frequency hopping pattern and/or the second UE 604b may transmit SRS 634 to the base station 602 based on the determined 630 frequency hopping pattern. Referring to fig. 8-10, the first UE 604a may transmit the SRS 804a to the base station 602 based on one of the hopping patterns 802, 822, 842 of fig. 8, the SRS 904a to the base station 602 based on one of the hopping patterns 902, 922, 942 of fig. 9, and/or the SRS 1004a to the base station 602 based on one of the hopping patterns 1002, 1022 of fig. 10. With further reference to fig. 8-10, the second UE 604b can transmit the SRS 804b to the base station 602 based on one of the hopping patterns 802, 822, 842 of fig. 8, the SRS 904b to the base station 602 based on one of the hopping patterns 902, 922, 942 of fig. 9, and/or the SRS 1004b to the base station 602 based on one of the hopping patterns 1002, 1022 of fig. 10.

Fig. 12 is a flow chart 1200 of a method of wireless communication. The method may be performed by a base station (e.g., base station 102/180, 310, 602). According to various aspects, one or more of the illustrated operations may be transposed, omitted, and/or performed concurrently.

At 1202, the base station may transmit SRS configuration information to the UE indicating at least a full SRS bandwidth. For example, referring to fig. 6, the base station 602 can transmit SRS configuration information 622a indicating at least a full SRS bandwidth to the first UE 604a and/or can transmit configuration information 622b indicating at least a full SRS bandwidth to the second UE 604 b.

At 1204, the base station may receive the SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration information, and the frequency hopping pattern may be limited to a portion of the SRS bandwidth that is less than the full SRS bandwidth. For example, the SRS configuration information may also indicate an RB set for each symbol in a set of symbols available for SRS transmission, and the frequency hopping pattern may be limited to at least one of a subset of the RB set or a subset of the set of symbols for each symbol. In some aspects, the ratio of the subset of RBs to the set of RBs for each symbol may be less than or equal to a threshold. In some other aspects, the respective subset of RBs of each symbol is different for at least two symbols in the set of symbols. In other aspects, the SRS configuration information also indicates a subset of RBs assigned to the UE. In some further aspects, the SRS configuration indicates a subset of the set of symbols assigned to (or activated for) the UE. In a still further aspect, the SRS configuration includes a bitmap having a first value corresponding to each symbol in a subset of the set of symbols assigned to the UE and having a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE. In some aspects, the SRS transmission may include a set of truncated portions of the sequence based on a number of RBs of the full SRS bandwidth. In some other aspects, the SRS transmission includes a sequence based on a number of RBs of the partial SRS bandwidth. In other aspects, the sequence is based on one or more cyclic shifts, and the number of one or more cyclic shifts may be based on a portion of SRS bandwidth. In a further aspect, the SRS transmission includes sequences orthogonal to each overlapping sequence over a portion of the SRS bandwidth.

For example, referring to fig. 6, the base station 602 may receive the SRS 632 from the first UE 604a according to a frequency hopping pattern based on the SRS configuration information 622a, and the frequency hopping pattern may be limited to a partial SRS bandwidth that is less than the full SRS bandwidth. Referring to fig. 8-10, the base station 602 can receive the SRS804a from the first UE 604a according to one of the hopping patterns 802, 822, 842 of fig. 8 based on the SRS configuration information 622a, the SRS 904a from the first UE 604a according to one of the hopping patterns 902, 922, 942 of fig. 9 based on the SRS configuration information 622a, and/or the SRS 1004a from the first UE 604a according to one of the hopping patterns 1002, 1022 of fig. 10 based on the SRS configuration information 622 a. Further, referring to fig. 6, the base station 602 may receive the SRS 634 from the second UE 604b according to a frequency hopping pattern based on the SRS configuration information 622b, and the frequency hopping pattern may be limited to a partial SRS bandwidth smaller than the full SRS bandwidth. Referring to fig. 8-10, the base station 602 can receive the SRS804 b from the second UE 604b according to one of the hopping patterns 802, 822, 842 of fig. 8 based on the SRS configuration information 622b, the SRS 904b from the second UE 604b according to one of the hopping patterns 902, 922, 942 of fig. 9 based on the SRS configuration information 622b, and/or the SRS 1004b from the second UE 604b according to one of the hopping patterns 1002, 1022 of fig. 10 based on the SRS configuration information 622 b.

It should be understood that the specific order or hierarchy of blocks in the processes/flowcharts disclosed is an illustration of example approaches. It should be appreciated that the particular order or hierarchy of blocks in the process/flow diagram may be rearranged based on design preferences. Furthermore, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more". Terms such as "if," when "and" while at "should be interpreted as" under conditions of "when at" rather than implying an immediate time relationship or reaction. That is, the terms (e.g., "when......when.)") does not imply responding to an action. Or an immediate action during the occurrence of the action, but rather only implies that an action will occur if a condition is met, but does not require a specific or immediate time constraint for the action to occur. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. The term "some" refers to one or more unless specifically stated otherwise. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" include any combination of A, B and/or C, and may include multiple a, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B or C", "one or more of A, B, or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" may be a alone, B alone, C, A and B, A and C, B and C, or a and B and C, wherein any such combination may comprise one or more members or several members of A, B or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words "module," mechanism, "" element, "" device, "and the like may not be a substitute for the word" unit. Thus, any claim element should not be construed as a functional unit unless the element is explicitly recited using the phrase "unit for.

Claims (62)

Translated fromUnknown language

1.一种由用户设备(UE)进行无线通信的方法，包括：1. A method for wireless communication by a user equipment (UE), comprising:从基站接收指示全SRS带宽的探测参考信号(SRS)配置信息；receiving, from a base station, sounding reference signal (SRS) configuration information indicating a full SRS bandwidth;基于所述SRS配置信息来确定用于SRS传输的跳频模式，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于所述SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项；以及determining a frequency hopping pattern for SRS transmission based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for the SRS transmission, and the frequency hopping pattern being restricted to at least one of a subset of the set of RBs for each symbol or a subset of the set of symbols; and基于所述跳频模式来向所述基站发送所述SRS传输。The SRS transmission is sent to the base station based on the frequency hopping pattern.2.根据权利要求1所述的方法，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。2 . The method according to claim 1 , wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.3.根据权利要求1所述的方法，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。3 . The method of claim 1 , wherein the subset of the corresponding RB set for each symbol is different for at least two symbols in the symbol set.4.根据权利要求1所述的方法，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。4 . The method of claim 1 , wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.5.根据权利要求1所述的方法，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。The method of claim 1 , wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.6.根据权利要求5所述的方法，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。6. The method of claim 5 , wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.7.根据权利要求1所述的方法，还包括：7. The method according to claim 1, further comprising:基于所述全SRS带宽的RB的数量来生成序列；以及generating a sequence based on the number of RBs of the full SRS bandwidth; and将所述序列的截断部分指派给所述符号集合的所述子集中的每个符号，assigning a truncated portion of the sequence to each symbol in the subset of the set of symbols,其中，所述SRS传输包括被指派给所述符号集合的所述子集的所述序列的每个截断部分。wherein the SRS transmission comprises each truncated portion of the sequence assigned to the subset of the set of symbols.8.根据权利要求1所述的方法，还包括：8. The method according to claim 1, further comprising:基于所述部分SRS带宽的RB的数量来生成序列，generating a sequence based on the number of RBs of the partial SRS bandwidth,其中，所述SRS传输包括所述序列。The SRS transmission includes the sequence.9.根据权利要求8所述的方法，其中，所述序列是基于一个或多个循环移位来生成的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。9. The method of claim 8, wherein the sequence is generated based on one or more cyclic shifts, and a number of the one or more cyclic shifts is based on the partial SRS bandwidth.10.根据权利要求1所述的方法，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。10. The method of claim 1, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.11.一种由基站进行无线通信的方法，包括：11. A method for wireless communication by a base station, comprising:向用户设备(UE)发送指示全SRS带宽的探测参考信号(SRS)配置信息；sending a sounding reference signal (SRS) configuration information indicating a full SRS bandwidth to a user equipment (UE);根据基于所述SRS配置信息的跳频模式来从所述UE接收SRS传输，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项。and receiving an SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for SRS transmission, and the frequency hopping pattern being restricted to a subset of the set of RBs for each symbol or at least one of a subset of the set of symbols.12.根据权利要求11所述的方法，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。12 . The method of claim 11 , wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.13.根据权利要求11所述的方法，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。13. The method of claim 11, wherein the subset of the corresponding RB set for each symbol is different for at least two symbols in the symbol set.14.根据权利要求11所述的方法，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。The method of claim 11 , wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.15.根据权利要求11所述的方法，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。15 . The method of claim 11 , wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.16.根据权利要求15所述的方法，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。16. The method of claim 15 , wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.17.根据权利要求11所述的方法，其中，所述SRS传输包括基于所述全SRS带宽的RB的数量的序列的截断部分的集合。17. The method of claim 11, wherein the SRS transmission comprises a set of truncated portions of a sequence based on a number of RBs of the full SRS bandwidth.18.根据权利要求11所述的方法，其中，所述SRS传输包括基于所述部分SRS带宽的RB的数量的序列。18. The method of claim 11, wherein the SRS transmission comprises a sequence based on a number of RBs of the partial SRS bandwidth.19.根据权利要求18所述的方法，其中，所述序列是基于一个或多个循环移位的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。19. The method of claim 18, wherein the sequence is based on one or more cyclic shifts, and the number of the one or more cyclic shifts is based on the partial SRS bandwidth.20.根据权利要求11所述的方法，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。20. The method of claim 11, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.21.一种用于由用户设备(UE)进行无线通信的装置，包括：21. An apparatus for wireless communication by a user equipment (UE), comprising:存储器；以及Memory; and至少一个处理器，其耦合到所述存储器并且被配置为：at least one processor coupled to the memory and configured to:从基站接收指示全SRS带宽的探测参考信号(SRS)配置信息；receiving, from a base station, sounding reference signal (SRS) configuration information indicating a full SRS bandwidth;基于所述SRS配置信息来确定用于SRS传输的跳频模式，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于所述SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项；以及determining a frequency hopping pattern for SRS transmission based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for the SRS transmission, and the frequency hopping pattern being restricted to at least one of a subset of the set of RBs for each symbol or a subset of the set of symbols; and基于所述跳频模式来向所述基站发送所述SRS传输。The SRS transmission is sent to the base station based on the frequency hopping pattern.22.根据权利要求21所述的装置，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。22. The apparatus of claim 21, wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.23.根据权利要求21所述的装置，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。23. The apparatus of claim 21, wherein the subset of the corresponding RB set for each symbol is different for at least two symbols in the set of symbols.24.根据权利要求21所述的装置，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。24. The apparatus of claim 21, wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.25.根据权利要求21所述的装置，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。25. The apparatus of claim 21, wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.26.根据权利要求25所述的装置，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。26. The apparatus of claim 25, wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.27.根据权利要求21所述的装置，其中，所述至少一个处理器还被配置为：27. The apparatus of claim 21 , wherein the at least one processor is further configured to:基于所述全SRS带宽的RB的数量来生成序列；以及generating a sequence based on the number of RBs of the full SRS bandwidth; and将所述序列的截断部分指派给所述符号集合的所述子集中的每个符号，assigning a truncated portion of the sequence to each symbol in the subset of the set of symbols,其中，所述SRS传输包括被指派给所述符号集合的所述子集的所述序列的每个截断部分。wherein the SRS transmission comprises each truncated portion of the sequence assigned to the subset of the set of symbols.28.根据权利要求21所述的装置，其中，所述至少一个处理器还被配置为：28. The apparatus of claim 21 , wherein the at least one processor is further configured to:基于所述部分SRS带宽的RB的数量来生成序列，generating a sequence based on the number of RBs of the partial SRS bandwidth,其中，所述SRS传输包括所述序列。The SRS transmission includes the sequence.29.根据权利要求28所述的装置，其中，所述序列是基于一个或多个循环移位来生成的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。29. The apparatus of claim 28, wherein the sequence is generated based on one or more cyclic shifts, a number of the one or more cyclic shifts being based on the partial SRS bandwidth.30.根据权利要求21所述的装置，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。30. The apparatus of claim 21, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.31.一种由基站进行无线通信的装置，包括：31. An apparatus for wireless communication by a base station, comprising:存储器；以及Memory; and至少一个处理器，其耦合到所述存储器并且被配置为：at least one processor coupled to the memory and configured to:向用户设备(UE)发送指示全SRS带宽的探测参考信号(SRS)配置信息；sending a sounding reference signal (SRS) configuration information indicating a full SRS bandwidth to a user equipment (UE);根据基于所述SRS配置信息的跳频模式来从所述UE接收SRS传输，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项。and receiving an SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for SRS transmission, and the frequency hopping pattern being restricted to a subset of the set of RBs for each symbol or at least one of a subset of the set of symbols.32.根据权利要求31所述的装置，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。32. The apparatus of claim 31, wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.33.根据权利要求31所述的装置，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。33. The apparatus of claim 31 , wherein the subset of the corresponding set of RBs for each symbol is different for at least two symbols in the set of symbols.34.根据权利要求31所述的装置，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。34. The apparatus of claim 31, wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.35.根据权利要求31所述的装置，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。35. The apparatus of claim 31, wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.36.根据权利要求35所述的装置，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。36. The apparatus of claim 35, wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.37.根据权利要求31所述的装置，其中，所述至少一个处理器还被配置为：其中，所述SRS传输包括基于所述全SRS带宽的RB的数量的序列的截断部分的集合。37. The apparatus of claim 31 , wherein the at least one processor is further configured to: wherein the SRS transmission comprises a set of truncated portions of a sequence based on a number of RBs of the full SRS bandwidth.38.根据权利要求31所述的装置，其中，所述SRS传输包括基于所述部分SRS带宽的RB的数量的序列。38. The apparatus of claim 31, wherein the SRS transmission comprises a sequence based on a number of RBs of the partial SRS bandwidth.39.根据权利要求38所述的装置，其中，所述序列是基于一个或多个循环移位的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。39. The apparatus of claim 38, wherein the sequence is based on one or more cyclic shifts, a number of the one or more cyclic shifts being based on the partial SRS bandwidth.40.根据权利要求31所述的装置，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。40. The apparatus of claim 31, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.41.一种用于由用户设备(UE)进行无线通信的装置，包括：41. An apparatus for wireless communication by a user equipment (UE), comprising:用于从基站接收指示全SRS带宽的探测参考信号(SRS)配置信息的单元；means for receiving, from a base station, sounding reference signal (SRS) configuration information indicating a full SRS bandwidth;用于基于所述SRS配置信息来确定用于SRS传输的跳频模式的单元，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于所述SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项；以及means for determining a frequency hopping pattern for SRS transmission based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for the SRS transmission, and the frequency hopping pattern being restricted to at least one of a subset of the set of RBs for each symbol or a subset of the set of symbols; and用于基于所述跳频模式来向所述基站发送所述SRS传输的单元。Means for sending the SRS transmission to the base station based on the frequency hopping pattern.42.根据权利要求41所述的装置，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。42. The apparatus of claim 41, wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.43.根据权利要求41所述的装置，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。43. The apparatus of claim 41, wherein the subset of the corresponding set of RBs for each symbol is different for at least two symbols in the set of symbols.44.根据权利要求41所述的装置，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。44. The apparatus of claim 41, wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.45.根据权利要求41所述的装置，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。45. The apparatus of claim 41, wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.46.根据权利要求45所述的装置，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。46. The apparatus of claim 45, wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.47.根据权利要求41所述的装置，还包括：47. The apparatus of claim 41 , further comprising:用于基于所述全SRS带宽的RB的数量来生成序列的单元；以及means for generating a sequence based on the number of RBs of the full SRS bandwidth; and用于将所述序列的截断部分指派给所述符号集合的所述子集中的每个符号的单元，means for assigning a truncated portion of said sequence to each symbol of said subset of said set of symbols,其中，所述SRS传输包括被指派给所述符号集合的所述子集的所述序列的每个截断部分。wherein the SRS transmission comprises each truncated portion of the sequence assigned to the subset of the set of symbols.48.根据权利要求41所述的装置，还包括：48. The apparatus of claim 41 , further comprising:用于基于所述部分SRS带宽的RB的数量来生成序列的单元，means for generating a sequence based on the number of RBs of the partial SRS bandwidth,其中，所述SRS传输包括所述序列。The SRS transmission includes the sequence.49.根据权利要求48所述的装置，其中，所述序列是基于一个或多个循环移位来生成的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。49. The apparatus of claim 48, wherein the sequence is generated based on one or more cyclic shifts, a number of the one or more cyclic shifts being based on the partial SRS bandwidth.50.根据权利要求41所述的装置，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。50. The apparatus of claim 41, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.51.一种由基站进行无线通信的装置，包括：51. An apparatus for wireless communication by a base station, comprising:用于向用户设备(UE)发送指示全SRS带宽的探测参考信号(SRS)配置信息的单元；means for sending sounding reference signal (SRS) configuration information indicating a full SRS bandwidth to a user equipment (UE);用于根据基于所述SRS配置信息的跳频模式来从所述UE接收SRS传输的单元，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项。and means for receiving an SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for SRS transmission, and the frequency hopping pattern being restricted to at least one of a subset of the set of RBs for each symbol or a subset of the set of symbols.52.根据权利要求51所述的装置，其中，每个符号的所述RB集合的所述子集与所述RB集合的比率小于或等于门限。52. The apparatus of claim 51, wherein a ratio of the subset of the RB set to the RB set for each symbol is less than or equal to a threshold.53.根据权利要求51所述的装置，其中，每个符号的相应的RB集合的子集对于所述符号集合中的至少两个符号是不同的。53. The apparatus of claim 51 , wherein the subset of the corresponding set of RBs for each symbol is different for at least two symbols in the set of symbols.54.根据权利要求51所述的装置，其中，所述SRS配置信息还指示被指派给所述UE的所述RB集合的所述子集。54. The apparatus of claim 51, wherein the SRS configuration information further indicates the subset of the RB set assigned to the UE.55.根据权利要求51所述的装置，其中，所述SRS配置信息指示被指派给所述UE的所述符号集合的所述子集。55. The apparatus of claim 51, wherein the SRS configuration information indicates the subset of the set of symbols assigned to the UE.56.根据权利要求55所述的装置，其中，所述SRS配置信息包括位图，所述位图具有与被指派给所述UE的所述符号集合的所述子集中的每个符号相对应的第一值以及与未被指派给所述UE的所述符号集合中的每个剩余符号相对应的第二值。56. The apparatus of claim 55, wherein the SRS configuration information comprises a bitmap having a first value corresponding to each symbol in the subset of the set of symbols assigned to the UE and a second value corresponding to each remaining symbol in the set of symbols not assigned to the UE.57.根据权利要求51所述的装置，其中，所述SRS传输包括基于所述全SRS带宽的RB的数量的序列的截断部分的集合。57. The apparatus of claim 51, wherein the SRS transmission comprises a set of truncated portions of a sequence based on a number of RBs of the full SRS bandwidth.58.根据权利要求51所述的装置，其中，所述SRS传输包括基于所述部分SRS带宽的RB的数量的序列。58. The apparatus of claim 51, wherein the SRS transmission comprises a sequence based on a number of RBs of the partial SRS bandwidth.59.根据权利要求58所述的装置，其中，所述序列是基于一个或多个循环移位的，所述一个或多个循环移位的数量是基于所述部分SRS带宽的。59. The apparatus of claim 58, wherein the sequence is based on one or more cyclic shifts, the number of the one or more cyclic shifts being based on the partial SRS bandwidth.60.根据权利要求51所述的装置，其中，所述SRS传输包括与所述部分SRS带宽上的每个重叠序列正交的序列。60. The apparatus of claim 51, wherein the SRS transmission comprises a sequence that is orthogonal to each overlapping sequence over the portion of the SRS bandwidth.61.一种存储用于由用户设备(UE)进行无线通信的计算机可执行代码的计算机可读介质，所述代码在由处理器执行时使得所述处理器进行以下操作：61. A computer-readable medium storing computer-executable code for wireless communication by a user equipment (UE), the code, when executed by a processor, causing the processor to:从基站接收指示全SRS带宽的探测参考信号(SRS)配置信息；receiving, from a base station, sounding reference signal (SRS) configuration information indicating a full SRS bandwidth;基于所述SRS配置信息来确定用于SRS传输的跳频模式，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于所述SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项；以及determining a frequency hopping pattern for SRS transmission based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for the SRS transmission, and the frequency hopping pattern being restricted to at least one of a subset of the set of RBs for each symbol or a subset of the set of symbols; and基于所述跳频模式来向所述基站发送所述SRS传输。The SRS transmission is sent to the base station based on the frequency hopping pattern.62.一种存储用于由基站进行无线通信的计算机可执行代码的计算机可读介质，所述代码在由处理器执行时使得所述处理器进行以下操作：62. A computer-readable medium storing computer-executable code for wireless communication by a base station, the code, when executed by a processor, causing the processor to:向用户设备(UE)发送指示全SRS带宽的探测参考信号(SRS)配置信息；sending a sounding reference signal (SRS) configuration information indicating a full SRS bandwidth to a user equipment (UE);根据基于所述SRS配置信息的跳频模式来从所述UE接收SRS传输，所述跳频模式被限制为小于所述全SRS带宽的部分SRS带宽，其中，所述SRS配置信息还指示可用于SRS传输的符号集合中的每个符号的资源块(RB)集合，并且所述跳频模式被限制为每个符号的所述RB集合的子集或所述符号集合的子集中的至少一项。and receiving an SRS transmission from the UE according to a frequency hopping pattern based on the SRS configuration information, the frequency hopping pattern being restricted to a portion of the SRS bandwidth that is less than the full SRS bandwidth, wherein the SRS configuration information further indicates a set of resource blocks (RBs) for each symbol in a set of symbols that may be used for SRS transmission, and the frequency hopping pattern being restricted to a subset of the set of RBs for each symbol or at least one of a subset of the set of symbols.